I also voted for #1 since it's the most realistic one and also because it has sort-off a 3D effect like the other icons on here. It basically looks like it "belongs" here.
This may be a dumb question but does this mean that every time you do an upgrade you have to redo some/all of the icons? If that's the case I''ll guess that you don't look forward to an upgrade at times with all the extras that have to be added in (although once it's done it's well worth it!
).